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How is the resolving power of a compound microscope affected if (a) wavelength of light used is decreased, and (b) the diameter of its objective lens is increased? Justify your answers. |
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Answer» Solution :The resolving power of a compound microscope is GIVEN as : `R.P.=(2nsinalpha)/(1.22lamda)` where n = refractive index of medium present between the object and the objective lens. `2alpha` is the angle subtended by the microscope objective at the object and `lamda` = WAVELENGTH of LIGHT used to illuminate the object. (i) If wavelength `lamda` is decreased then as per above relation resolving power of microscope increases. (ii) If diameter of objective lens is increased, value of `.alpha.` and consequently sin `alpha` increases and so the resolving power increases. |
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